😀Hi,
 
	Recently brought a 645ci .
 
	Expansion tank full/empty level indicator was broken , but float was working.
 
	Changed reservoir tank and now the coolant warning light intermittently comes  on , checked coolant and it is full.
 
	Could it be faulty expansion tank or air lock?
 
	Car is running fine and not overheating.
 
	Welcome any ideas.
 
	Regards
 
	Neal